Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 8, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Jul 31, 2012, 11:51 AM PDT for Riverside County, California. It was in force for 105 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 31, 2012, 11:51 AM PDT (18:51 UTC)
- Expired
- Jul 31, 2012, 1:36 PM PDT
- In force
- 105 min
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Riverside County, CA
The radar
The San Diego radar (KNKX), 129 km from the middle of the area, began a volume at 18:51 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 31, 12:12 PM PDT | FLASH FLOOD | 5 Ne Indio, CA | DILLON ROAD AND FARGO CANYON ROAD FLOODED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 6.9 hours before the alert went out and 149 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1285 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
108
WGUS56 KSGX 311851
FFWSGX
CAC065-312045-
/O.NEW.KSGX.FF.W.0008.120731T1851Z-120731T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
1151 AM PDT TUE JUL 31 2012
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 145 PM PDT
* AT 1140 AM PDT...HEAVY RAIN FROM A SLOW MOVING THUNDERSTORM WAS
OVER THE LITTLE SAN BERNARDINO MOUNTAINS EAST OF THE TOWN OF
COACHELLA.
* FLASH FLOODING AND MUD FLOWS ARE POSSIBLE ON DILLON ROAD AND THE
EASTERN SECTIONS OF THE COACHELLA VALLEY. FLASH FLOODING IS ALSO
POSSIBLE ON INTERSTATE 10 EAST OF INDIO.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DEBRIS FLOWS...INCLUDING MUD AND ROCK SLIDES...ARE EXPECTED WITH THIS
STORM. MUD SLIDES AND ROCK SLIDES CAN POTENTIALLY TRAP AND KILL
PEOPLE CAUGHT IN THEIR PATH.
&&
LAT...LON 3385 11613 3383 11613 3374 11600 3374 11594
3352 11595 3352 11609 3391 11626 3391 11618
$$
MOEDE3 follow-up statements
436
WGUS76 KSGX 311933
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1233 PM PDT TUE JUL 31 2012
CAC065-312045-
/O.CON.KSGX.FF.W.0008.000000T0000Z-120731T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-
1233 PM PDT TUE JUL 31 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 PM PDT FOR
CENTRAL RIVERSIDE COUNTY...
AT 1222 PM PDT...RADAR SHOWED A LARGE AREA OF HEAVY RAIN PRODUCING
FLASH FLOODING OVER THE EASTERN SLOPES OF THE LITTLE SAN BERNARDINO
MOUNTAINS AND THE EASTERN SECTIONS OF THE COACHELLA VALLEY.
FLASH FLOODING AND MUD FLOWS ARE MOST LIKELY ON DILLON ROAD
NORTHEAST OF INDIO. FLASH FLOODING IS ALSO LIKELY ALONG INTERSTATE
10 EAST OF COACHELLA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DEBRIS FLOWS...INCLUDING MUD AND ROCK SLIDES...ARE EXPECTED WITH THIS
STORM. MUD SLIDES AND ROCK SLIDES CAN POTENTIALLY TRAP AND KILL
PEOPLE CAUGHT IN THEIR PATH.
&&
LAT...LON 3385 11613 3383 11613 3374 11600 3374 11594
3352 11595 3352 11609 3391 11626 3391 11618
$$
MOEDE880
WGUS76 KSGX 312011
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
111 PM PDT TUE JUL 31 2012
CAC065-312045-
/O.CON.KSGX.FF.W.0008.000000T0000Z-120731T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-
111 PM PDT TUE JUL 31 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 PM PDT FOR
CENTRAL RIVERSIDE COUNTY...
AT 100 PM PDT...MODERATE RAIN CONTINUED OVER THE SOUTHERN COACHELLA
VALLEY NEAR MECCA AND THERMAL. THE HEAVIEST RAIN WILL MOVE SOUTH OF
THE VALLEY THROUGH 130 PM.
URBAN AND STREET FLOODING WAS REPORTED IN INDIO AND COACHELLA AT
1245 PM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.
&&
LAT...LON 3385 11613 3383 11613 3374 11600 3374 11594
3352 11595 3352 11609 3391 11626 3391 11618
$$
MOEDE090
WGUS76 KSGX 312036
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
136 PM PDT TUE JUL 31 2012
CAC065-312036-
/O.CAN.KSGX.FF.W.0008.000000T0000Z-120731T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-
136 PM PDT TUE JUL 31 2012
...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR THE COACHELLA
VALLEY...
AT 125 PM...RADAR SHOWED THE HEAVIEST RAINS HAD MOVED SOUTH OF THE
COACHELLA VALLEY.
BETWEEN NOON AND 1 PM...HEAVY RAIN FELL ACROSS BOX CANYON ROAD EAST
OF MECCA...AND ALSO ON INTERSTATE 10 EAST OF INDIO. WEATHER SPOTTERS
ALSO REPORTED STREET FLOODING IN INDIO.
LAT...LON 3385 11613 3383 11613 3374 11600 3374 11594
3352 11595 3352 11609 3391 11626 3391 11618
$$
MOEDEThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 7:45 PM PDT | Flash Flood Watch | SGX | Riverside, San Bernardino, San Diego | 23 hr |
| Jul 31, 1:23 PM PDT | Flash Flood Warning | SGX | San Diego | 82 min |
| Jul 31, 2:26 PM PDT | Flash Flood Warning | SGX | Riverside | 109 min |
Nearby
Flash Flood Warnings in California, 2012Every flash flood warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.